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Chapter 2. Uninterruptible power supply overview
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© Copyright IBM Corp. 2003, 2004
The uninterruptible power supply provides the SAN Volume Controller with a
secondary power source to be used if you lose power from your primary power
source due to power failures, power sags, power surges, or line noise. If a power
outage occurs, the uninterruptible power supply will maintain power long enough
to save any configuration and cache data contained in the dynamic random access
memory (DRAM). The data will be saved to the SAN Volume Controller internal
disk.
Figure 15. Uninterruptible power supply
Note: The SAN Volume Controller uninterruptible power supply is an integral
part of the SAN Volume Controller solution, and maintains continuous SAN
Volume Controller-specific communications with its attached SAN Volume
Controller nodes. The SAN Volume Controller uninterruptible power supply
must be used in accordance with documented guidelines and procedures
and must not be used for any other purpose.
To provide full redundancy and concurrent maintenance, SAN Volume Controllers
must be installed in pairs. Each SAN Volume Controller of a pair must be
connected to a different uninterruptible power supply. Each uninterruptible power
supply can support up to two SAN Volume Controller nodes. It is also
recommended that you connect the two uninterruptible power supply units for the
pair to different independent electrical power sources. This reduces the chance of
an input power failure at both uninterruptible power supply units.
Attention:
1. Do not connect the uninterruptible power supplies to an input power source
that does not conform to standards. Review the requirements for
uninterruptible power supplies.
2. Each uninterruptible power supply pair must power only one SAN Volume
Controller cluster.
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